Read up on some of the write ups on here...
On the 2006, it's fairly easy. Dremel out the plastic center, fab up the mesh, secure it with screws...I found the hardest part choosing the right mesh to work with.
I know there have been several who have done it. But, off the top of my head, MyToy4 has a thread on hers, she and her hubs did an awesome job on it!